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Goodwill and Intangible Assets - Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2015 $ 93  
2016 372  
2017 372  
2018 372  
2019 372  
2020 372  
Thereafter 1,975  
Total $ 3,928 $ 4,212